Then I returned
shuwb (shoob)
to turn back (hence, away) transitively or intransitively, literally or figuratively
and I saw
ra'ah (raw-aw')
to see, literally or figuratively (in numerous applications, direct and implied, transitive, intransitive and causative)surely, think, view, visions.
vanity
hebel (heh'bel)
emptiness or vanity; figuratively, something transitory and unsatisfactory; often used as an adverb -- altogether, vain, vanity.
under the sun
shemesh (sheh'-mesh)
the sun; by implication, the east; figuratively, a ray, i.e. (arch.) a notched battlement -- + east side(-ward), sun (rising), + west(-ward), window.